Method for copy protection of DVD recorder

Abstract

A method for copy protection of DVD recorder with a microprocessor connected with a primary chipset in a DVD recorder. First, the microprocessor generates three bytes stored into a buffer. The buffer is a data memory in the microprocessor. The three bytes in the buffer are then read to the primary chipset in the DVD recorder. The first byte is checked to see whether it is wrong or not. If there is no error, the other two bytes are received, and the three bytes are then sent back to the microprocessor, which checks whether the three bytes are correct or not for at least once. If the three bytes are correct, the primary chipset in the DVD recorder is determined to be genuine, and the DVD recorder can record.

1 . A method for copy protection of DVD recorder with a microprocessor connected to a primary chipset in a DVD recorder, said method at least comprising the steps of: 
 generating three bytes stored into a data memory, which is located in a memory unit of said microprocessor;    reading said three bytes from said data memory into said primary chipset in said DVD recorder;    checking whether the first byte is wrong or not;    receiving the other two bytes;    sending said three bytes back to said microprocessor; and    checking whether said three bytes are correct or not for many times;    
   
   
       2 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein the step of generating three bytes is accomplished by said microprocessor, and said three bytes are stored into said data memory of said microprocessor.  
   
   
       3 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein said step of reading said three bytes is accomplished by using said primary chipset in said DVD recorder to read said three bytes from said data memory of said microprocessor.  
   
   
       4 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein the first one of said three bytes is an ID code specially for said microprocessor, the second byte is a number of times of communication between said microprocessor and said primary chipset in said DVD recorder, and the third byte is an arbitrary value.  
   
   
       5 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein said three bytes are read from said data memory of said microprocessor again after a predetermined time elapses if the answer is yes in said step of checking whether said first byte is wrong or not; otherwise the next step is continued.  
   
   
       6 . The method for copy protection of DVD recorder as claimed in  claim 5 , wherein said predetermined time is 2 seconds.  
   
   
       7 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein said primary chipset in said DVD recorder continues to receive the second and third bytes from said data memory of said microprocessor in said step of receiving the other two bytes if the first byte is checked to be correct.  
   
   
       8 . The method for copy protection of DVD recorder as claimed in  claim 1 , wherein said step of sending said three bytes back to said microprocessor is accomplished by said primary chipset in said DVD recorder.  
   
   
       9 . The method for copy protection of DVD recorder as claimed in  claim 8 , wherein the first one of said three bytes is an ID code of said primary chipset in said DVD recorder, the second byte is a number of times of communication between said microprocessor and said primary chipset in said DVD recorder, and the third byte is an arbitrary value.  
   
   
       10 . The method for copy protection of DVD recorder as claimed in  claim 9 , wherein said ID code is some hexadecimal value, and said arbitrary value is also some hexadecimal value.  
   
   
       11 . The method for copy protection of DVD recorder as claimed in  claim 9 , wherein said three bytes that are received and sent back are checked to see whether said three bytes are correct or not for at least once in said step of checking whether said three bytes are correct for many times, the primary chipset in said DVD recorder is determined to be genuine and said DVD recorder can record if the answer is yes; otherwise said primary chipset in said DVD recorder is determined to be pirated and said DVD recorder can only playback but can't record.